Antlr4.Parse.ScopeParser._ParsePostfixDecl C# (CSharp) Method

        public static System.Tuple<int, int> _ParsePostfixDecl(Attribute attr, string decl, ActionAST a, Grammar g)
        {
            int start = -1;
            int stop = -1;
            int colon = decl.IndexOf(':');
            int namePartEnd = colon == -1 ? decl.Length : colon;

            // look for start of name
            for (int i = 0; i < namePartEnd; ++i)
            {
                char ch = decl[i];
                if (char.IsLetterOrDigit(ch) || ch == '_')
                {
                    start = i;
                    break;
                }
            }

            if (start == -1)
            {
                start = 0;
                g.tool.errMgr.GrammarError(ErrorType.CANNOT_FIND_ATTRIBUTE_NAME_IN_DECL, g.fileName, a.Token, decl);
            }

            // look for stop of name
            for (int i = start; i < namePartEnd; ++i)
            {
                char ch = decl[i];
                if (!(char.IsLetterOrDigit(ch) || ch == '_'))
                {
                    stop = i;
                    break;
                }
                if (i == namePartEnd - 1)
                {
                    stop = namePartEnd;
                }
            }

            if (stop == -1)
            {
                stop = start;
            }

            // extract name from decl
            attr.name = decl.Substring(start, stop - start);

            // extract type from decl (could be empty)
            if (colon == -1)
            {
                attr.type = "";
            }
            else
            {
                attr.type = decl.Substring(colon + 1, decl.Length - colon - 1);
            }
            attr.type = attr.type.Trim();

            if (attr.type.Length == 0)
            {
                attr.type = null;
            }
            return Tuple.Create(start, stop);
        }